Electric pick mining-machine.



I A SANDSTROM.

ELECTRIC PICK MINING MACHINE. APPLICATION IIL'ED APRJ, 1904. RENEWED APR. 7, 190a.

Patented Nov. 10,1908.

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A. SANDSTROM. ELECTRIC PICK MINING MACHINE.

APPLICATION FILED APB.1, 1904. nmmwxm APR. 7, 1903.

w Patented Nov 10, 1908.

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A. SANDSTROM.

ELECTRIC PICK MINING MACHINE.

APPLICATION FILED 3.1, 1904. mnnwsn APR. 7, 1908'.

903,508. Patented Nov. 10,1908.

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WITNESSES: INl/E/JTDI? terial fOIIlJhlS purpose.

UNITED STATES rnrnivr ALFRED SANDSTROM, OF CHICAGO, ILLINOIS, ASSIGNOR TO JCHN F. BUSH, OF CHICAGO,

- ILLINOIS.

ELECTRIC PICK MINING-MACHINE.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Application filed A pri11, 1904:, Serial No. 201,187. Renewed April 7, 1908. Serial No. 425,704.

T all whom it may concern:

Be it known that I, ALFRED SANDSTROM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi- 1101s, have invented certain new and useful Improvements in Electric Pick Mining-Machines, of which the following is a specification.

This invention relates to coal mining machines of the type generally known as pick machines? and its object is to provide a machine of this character of simple and substantial construction and adapted to be driven electrically.

The invention has other objects in view which will be fully pointed out hereinafter in the detail description, reference being had to the'accompanying drawings which show one manner of embodying the invention in physical form and in which Fig. 1 is a top plan view of a pick machine embodying the invention andishown partly in section with the lid removed.

Fig.2 is a longitudinal sectional view. Fig. 3 shows means for releasing the compression cylinder by breaking the exciting currentto the magnet.

Fig. 4 shows mechanical means for holding the compression cylinder.

Figs. 5-9 show diagrammatically, and partly in section, various modifications of the invention.

Like characters of reference indicate corresponding parts in the several figures and referring thereto9 designates the casing which incloses the operative parts of the invention and which is mounted on wheels 10 and can be made of any suitable size, shape and ma- An electric motor 1 1 of suitable construction is secured to the rear endof the casing and its armature 12 carries a spur pinion '13 which drives a spur gear 14 and guided by guides 21.

on the crank shaft 15 journaled in suitable bearings in the casing. This crank shaft is connected by a link 16 with-a piston rod 17 carrying a piston 18 within the cylinder 19 The cylinderis adaptedto move longitudinally in the cylindrical portion 22 of the casing at the rear end .Ofwhich an electro .magnet 23 is located. The coil 24' of this magnet is arranged in a shell 25 which is open at the front and the magnetic circuit will be completed around I the coil throughthe shell, the contiguous porrent for the motor. or resistance in the circuit 33 of' the electro tion 26 of the casing and the rear end of the cylinder. A tool rod 27 carrying a tool.28 is secured in an suitable manner to the front end of the cy inder and is guided in the cap 29 of the casing. 30'is the starting switch and 31 is the double cable carrying the cur- I provide a rheostat 32 device to hold the cylinder 19 in its rearwar position (Fig. 2) until the energy stored in w the cylinder by compression of the air therein on the continued forward movement of the piston is sufficient to overcome the holding power of the magnet, whereupon the cylinder and the tool will be thrust forward by the expansion of this ompressed'air. The air pressure for operating the tool is thus produced and utilized at each operation of the machine, that is to say, at each blow of the tool. The cylinder is provided with an opening 35 to register with a slot 36 in the cylindrical portion 22 of the casing and fthis opening is located in advance of the rear head of the cylinder so that a cushion of air will be formed between the piston and this head on the backward stroke of the cylinder to avoid shock to the machine. Another reason for locating the opening 35 in advance of the rear end. of the cylinder is to provide connection between the compression end of the cylinder and the atmosphere when the piston is at the limit of its rearward movement so that whatever air is lost by leakagepast the piston during the preceding operation of the machine may be replenished before the piston passes the opening 35 on its forward stroke. The piston is reciprocated' by the crank shaft and .on its backward stroke moves the cylinderbackto its rearward p.05

sition in contact with the magnet. T e magnet holds the cylinder until its power is overcome by, the pressure of the compressed air in front oi the piston in the front end of the cylinder The holding power of the magnet is controlled by the rheostat and the strike a heavy blow; when force of the blow struck by spondingly regulated. As the holding power of the magnet is increased reater pressure would be required in the cy inder to release it from the magnet and consequently'this greater pressure will thrust the cylinder forward with greater force and cause the pick to the holding ower of the magnet is decreased a correspon in 1y less pressure will be required in the cylin er to release it from the ma net and a corre-' spondingly lighter blow w' be struck by the pick. If the ick should fail to engage a resisting body the machine will be saved from shock by the air cushion between the piston and the head 20. My improved machine compresses air to store energy and utilizes this energy on the same strokeof the machine and thus I avoid. the necessity "for storage tanks or pipes because the power required for o crating the pick is derived initially. fromt e motor and produced as required for each operation of the pick. An electrically operated machine of this character presents many desirable advantages over machines operated pneumatically and otherwise because of its higher efficiency. and inconsiderable loss in transmitting the ower. The

wires required for transmitting t v e electricity are far cheaper and can be installed and maintained at considerably less expense than the hose and pipes for pneumatic machines which are commonly employed for this pure ose. p In Fig. 3 I have shownmeans for automatically opening the electric circuit of the electro magnet to release the com ression cylinder. A brush is connecte -t0 the pistonrod 17 and is carried thereby in engagementwith a stationary contact 71 which 18 supported in and insulated from a block 72 adjustably mounted on a hand screw 7 3.

The current travels from rheostat 32 through wire 7 4 to contact 71 and brush 72 and thence through the piston rod, cylinder and frame of magnet to the magnet coil and out through wire 75. When the iston is at the forward end of its stroke the brush will be carried off of the contact and thus break the current in the magnet which will cause the release of the cylinder. The time of the release can be regulated by the adjusting screw. 7

n Fig. 4 I have shown a mechanical means to take the place of the electro magnet for holding the pressure cylinder. This means consists of one or more sprinipressed dogs 37 adapted to engage the hoo the cylinder 19 and o erated by the tripping collar.39 which is slidbble on the iston 17, and, is ada ted to be e aged by t epro ection 40. t will be re dily understood that when the iston is moved forward, as heretofore described, the

projection 40 willeng e and cause the trip mg collar to disengage t e s and thus release the-cylthe pick is correposition of the s 38 on inder. The force of the blow to be struck by the pick can be regulated in this construction by controlling the time at which the cylinder is released from the dogs. with relation to the iston in the cylinder, and this is accomplished by means of an adjusting screw 41Which'is connected to the lower .end

of a lever 42, this lever being pivotally connected at its other end to the tripping collar and fulcrumed on the projection 40 which is made in the form of a depending arm fastened to the 41' the distance between the stop and the to orten or lengthen the stroke of the piston before the cylinder is released. i

.In Figs. 5 to 9 I have shown several other ways in which the invention can be embodied,

the object in each case being to hold the tool until a sufficient air pressure been produced, then to release the tool and utilize the said air pressure to drive the tool.

In these several part of the cylinder where there is atmospheric pressure, 0 indicates the space where the compression takes place, and m Fig. 8 V indicates where a artial vacuum may occur. In Figs. 1 and 2 t e'ma et 23 is located at the rear end of the cylin er but obviously the magnet could be located in front of the cylinder and on the tool rod as shown in Fig. 5 In this construction the magnet is rigidly held in the casing in any suitable manner'and a disk 4 3 is rigid on the tool rod to correspond to the head 20 or rear end of the cylinders in the construction of Fig. 2. It will be readily understood that the magnet will hold the disk, tool rod, cylinder and pick stationary until its holding ower has been overcome by the ressure-of the air in front of the piston in t e cylinder, whereupon the magnet will release the disk and the air pressure in the cylinder will force the cylinder, the tool rod tripping collar can be increased or decreased piston. By adjusting the screw 3 figures A designates that and the pick forward to strike the blow. In

Fig. 6 the positions of the cylinder and piston are reversed and the cylinder is connected by a link 44 to the crank shaft 16 while the piston rod 45 projects through the front end of the cylinder and carries the disk 43 and also the tool, thus takin the place of the tool rod, shown in Fig. 2. T construction is exactly similar to that hereto-' he operation of this fore described, except-that the cylinder is moved on the piston to compress the air.

two plstons 46, 47, the former being connected to the crank shaft 16, as shown in Fig. 2, and the latter being carried'by the tool rod 48 which extends into the c linder through the front end thereof. 'In t 's construction the compression takes place In Fig.7 I provide between the two pistons and for the pur ose of returning the cylinder to its backwar po sition I provide a cam 49on the crank-shaft, which is adapted tobperat .a lever 50 connected to a shifting rod 51 attached to the piston rod 48. In Fig. 8 I have shown a piston 52 connected to the crank shaft and operating in a compression chamber 53, and

. above the chamber 53 and connected therewith by the ports 57 and 58. In this construction the piston 52 is on its forward 1 stroke when moving to the left and consequently the air pressure is stored in front of the piston in the spaces marked C while a partial vacuumwill be behind the. piston in the spaces marked V. In Fig. 9'I have shown a construction somewhat similar to Fig. 7 except that two cylinders 59 and 60 connected respectively tothe crank shaft and the tool rod are movable on the pistons 61, 62 carried by the connectingrod 63. It will be apparent that all of these constructions come within the generic invention heretofore described more particularly in connection with Figs. 1 and 2 and while I am aware that various other changes and modifications in theconstruction and arrangement of parts may be made without departing from the spirit or sacrificing the scope of the invention believe that the foregoing is sufiicient to indicate the scope of the invention.

While I have shown and described the machine as particularly adapted for a ick mining machine it, will be understood t iat a tool of any desired character can be provided and the machine employed for drilling and other purposes.

Havlng thus fully-described my invention what I claim and desire,.to secure-by Letters from control of the said mag-net and thrust it Patent is: w c

1. In combination, a rec'iprocatory tool, a motor, means operated thereb for producing a pneumatic drive and inclu ing a cylinder and piston movable relatively to each other, to the movable one of which parts the tool is connected, and releasable engaging means for the movable part adapted to allow the release and forward drive of the tool when the air pressure overbalances the hold of the engaging means. L

2. In a'machine of the character described, a motor, a reciprocatory tool, means for holding the tool temporarily in fixed position, and means connected to the motor for roducing a suflicient air ressure in the mac ine' to release the tool rom the holding means.

3. In a machine of the character described,

a reci rocatory tool, .an electric magnet to hold t e tool in retracted position, a motor,v

and means operated by the motor for producing suff cient air pressure to release the tool forward.

4. In an electrically operated machine of the character described, a movable air compression" cylinder, a tool connected with said cylinder, means for holding said cylinder temporarily in fixed position, and. means for producingsuflicient pressure in the cylinder to release it from said holding means and enable said pressure to move the cylinder;

5. In an electrically operated machine of the character described, a movable air compression cylinder, 2. tool connected tosaid cylinder, an electro magnet'to hold the cylinder in retracted position, and reciprocatory means for producing a suificient air pressure in the cylinder at each stroke of the reciprocatory means to release the cylinder from -said magnet and permit the pressure to expand and thrust the cylinder andtool out- Ward.

6. In an electrically operated machine of the character described, a movable air compression cylinder, & tool connected to said means for producing in the machine a sufiicient air pressure to release the tool from its retracted osition and for utilizing 'the'exi pansion 0 said pressure to thrust the toolv outward.

8. In an electrically the character, described, a tool, an electro magnet, means to regulate the holding power of said magnet, and means for prooperated machine of ducing suflicient air pressure to overcome the holding power of the magnet and to op erate the tool.

9. In an electrically operated machine of the character described, a tool, an electro magnet, a variable resistance in the electric circuit'of said magnet, and means for producing a sufiicient air pressure in the machine for the urpose set forth. v

10. In com bination, a reciprocatory tool, a magnet for holding the tool in retracted position, and means for producing air pressure sufficient to release the tool from its retracted position and thrust it forward.

11. In combination, a reciprocatory tool, means for holding the tool releasably in retracted position, and means for producing air pressure sufficient to release the tool from its retracted position and thrust it forward.

-12. In a machine of the character described, a tool, a movable air, compression cylinder, a piston in said cylinder, a port 0 ening in said cylinder constantly open to t e atmosphere, and means for compressing the air in said cylinder for the purpose set forth.

13. In a machine of the character described, a casing, a tool, a movable air com--v pression cylinder operating in saidcasing, a

' in the casing,

piston in said cylinder, a port opening in said cylinder registering With an elongated slot and means for compressing air in said cylinder to operate the tool.

14. In an electrically o erated machine of the character describe a 'movable' air compression cylinder, a tool connected to the forward end thereof, an electro magnet. behind the cylinder to hold said cylinder and tool inretracted position, a piston in'the cylinder and means for operating the iston to produce sufficient pressure in the cydinder to release the cylinder from said. magnet and by expansion thrus the cylinder and tool outward. 15. In an electrically operated machine of' the character described, a movable air compression cylinder, a tool'connected to said cylinder, an electro magnet to hold the cylinder and tool in retracted position, a variable resistance in the, electric circuit of said magnet,-a-piston inthe cylinder, and means for operating the piston to produce sufiicient pressure in the cylinder to release-the cyllnder from said magnet and by expansion thrust the cylinder and tool outward.

16. In an electrically'operated machine of the characterdescribed, a movableair compression cylinder, a tool connected to said pjyl linder,

a piston in said cylinder, a crank aft connected to and operating said piston,

an electric motor for operating said shaft, and means for holding the cylinder until a sufficient air pressure has been produced thereln to cause the .tool to strike 'the re- 17. In an electrically operated machine of the character described, a movable air com-- pression cylinder, a piston in said cylinder, and a ort opening its--en s so that atmospheric ressure is maintained in the cylinder behind the piston during its advance stroke and until Sfild piston occupies a position behind said port.

18. In combination, a reciprocatory tool,

in said cylinder between compresse. d air.

a magnet for holdingv the tool in retracted position, an air compressionfcylinder and piston for producing air pressure sufficient to release the tool from its retracted position, and thrust it forward, means for re plenishing the air 'in the working end of the cylinder, and means for operating the cylinder and piston.

19. In"combination, means for holding the tracted position, an air compression cylinder and piston for producing air pressure sufficient to release.v the tool from its retracted tool releasable in reposition and thrust it forward, means for re- I plenishing the air in the working end of the.

cylinder, andmeans for operating the cylinder and piston.

20. In combination, a reciprocatory tool, means for roducing resilient pressure for operating the tool, and means termined holding power for restraining the drive of the tool until sufficient resilient of predea reciprocatory tool,

power is stored up to overbalance the said means of predetermined holding power, whereby the tool is driven by the stored up power? 21. In combination, a reciprocatory tool, means for roducing resilient pressure for operating t e tool, and .a magnet for. restraining, the drive of the tool until sufficient resilient power is stored up to overbalance the magnet, whereby the tool is release (land driven by the stored up power.

22. In combination, a-reciprocatory tool,

means for producing air pressure for opernet 'for restraining sufiicient pressure the magnet whereand driven byutlie atin the tool, and a ma the drive of the tool unti is secured to overbalance by the tool is released Witnesses JAMES W. LUTHER, ADoLPH H. LUKEIX.

ALFRED SANDSTROM. p 

